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FIGURE 34 Structure of a PDF document
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361 Document Catalog
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The root of a document s object hierarchy is the catalog dictionary, located via the Root entry in the trailer of the PDF le (see Section 344, File Trailer ) The catalog contains references to other objects de ning the document s contents, outline, article threads (PDF 11), named destinations, and other attributes In addition, it contains information about how the document should be displayed on the screen, such as whether its outline and thumbnail page images should be displayed automatically and whether some location other than the rst page should be shown when the document is opened Table 316 shows the entries in the catalog dictionary
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TABLE 316 Entries in the catalog dictionary
KEY TYPE VALUE
Type Version
name name
(Required) The type of PDF object that this dictionary describes; must be Catalog for the catalog dictionary (Optional; PDF 14) The version of the PDF speci cation to which the document conforms (for example, 14), if later than the version speci ed in the le s header (see Section 341, File Header ) If the header speci es a later version, or if this entry is absent, the document conforms to the version speci ed in the header This entry enables a PDF producer application to update the version using an incremental update; see Section 345, Incremental Updates (See implementation note 18 in Appendix H) Note: The value of this entry is a name object, not a number, and so must be preceded by a slash character (/) when written in the PDF le (for example, /14)
Pages PageLabels
dictionary number tree
(Required; must be an indirect reference) The page tree node that is the root of the document s page tree (see Section 362, Page Tree ) (Optional; PDF 13) A number tree (see Section 385, Number Trees ) de ning the page labeling for the document The keys in this tree are page indices; the corresponding values are page label dictionaries (see Section 831, Page Labels ) Each page index denotes the rst page in a labeling range to which the speci ed page label dictionary applies The tree must include a value for page index 0 (Optional; PDF 12) The document s name dictionary (see Section 363, Name Dictionary )
Names
dictionary
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(Optional; PDF 11; must be an indirect reference) A dictionary of names and corresponding destinations (see Named Destinations on page 476) (Optional; PDF 12) A viewer preferences dictionary (see Section 81, Viewer Preferences ) specifying the way the document is to be displayed on the screen If this entry is absent, viewer applications should use their own current user preference settings (Optional) A name object specifying the page layout to be used when the document is opened:
SinglePage OneColumn TwoColumnLeft TwoColumnRight
ViewerPreferences
dictionary
PageLayout
name
Display one page at a time Display the pages in one column Display the pages in two columns, with oddnumbered pages on the left Display the pages in two columns, with oddnumbered pages on the right
(See implementation note 19 in Appendix H) Default value: SinglePage
PageMode
name
(Optional) A name object specifying how the document should be displayed when opened:
UseNone UseOutlines UseThumbs FullScreen
Neither document outline nor thumbnail images visible Document outline visible Thumbnail images visible Full-screen mode, with no menu bar, window controls, or any other window visible
Default value: UseNone
Outlines
dictionary
(Optional; must be an indirect reference) The outline dictionary that is the root of the document s outline hierarchy (see Section 822, Document Outline ) (Optional; PDF 11; must be an indirect reference) An array of thread dictionaries representing the document s article threads (see Section 832, Articles ) (Optional; PDF 11) A value specifying a destination to be displayed or an action to be performed when the document is opened The value is either an array de ning a destination (see Section 821, Destinations ) or an action dictionary representing an action (Section 85, Actions ) If this entry is absent, the document should be opened to the top of the rst page at the default magni cation factor